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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002-2004 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
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* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
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* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
package org.apache.commons.collections;
import java.util.Collection;
/**
* Defines a collection that allows objects to be removed in some well-defined order.
*
* The removal order can be based on insertion order (eg, a FIFO queue or a
* LIFO stack), on access order (eg, an LRU cache), on some arbitrary comparator
* (eg, a priority queue) or on any other well-defined ordering.
*
* Note that the removal order is not necessarily the same as the iteration
* order. A Buffer
implementation may have equivalent removal
* and iteration orders, but this is not required.
*
* This interface does not specify any behavior for
* {@link Object#equals(Object)} and {@link Object#hashCode} methods. It
* is therefore possible for a Buffer
implementation to also
* also implement {@link java.util.List}, {@link java.util.Set} or
* {@link Bag}.
*
* @since Commons Collections 2.1
* @version $Revision: 1.9 $ $Date: 2004/01/14 21:43:04 $
*
* @author Avalon
* @author Berin Loritsch
* @author Paul Jack
* @author Stephen Colebourne
*/
public interface Buffer extends Collection {
/**
* Gets and removes the next object from the buffer.
*
* @return the next object in the buffer, which is also removed
* @throws BufferUnderflowException if the buffer is already empty
*/
Object remove();
/**
* Gets the next object from the buffer without removing it.
*
* @return the next object in the buffer, which is not removed
* @throws BufferUnderflowException if the buffer is empty
*/
Object get();
}